JS导出页面为PDF文件，该如何操作？来看一眼就明白啦！

废话不多说，直接上代码。

1.资源文件或依赖

<script type="text/javascript" src="./js/canvg2.js"></script>
<script type="text/javascript" src="./js/html2canvas-0.4.1.js"></script>
<script type="text/javascript" src="./js/jspdf.min.js"></script>
<script type="text/javascript" src="./js/jquery-2.1.4.min.js"></script> ???

2. HTML代码

<div class="container">
 ???<input id="downloadPdf" type="button" value="Download PDF"/>
</div>
<div id="pdfContainer" class="container"> ?????????????????????导出范围是ID为pdfContainer的div所在的区域
 ???<div>点击上面的按钮，蓝色框区域内的内容将会被导出为pdf.</div>
</div>

3. JS代码

<script type="text/javascript">
 ???$(function () {
 ???????$("#downloadPdf").click(function () {
 ???????????var targetDom = $("#pdfContainer");
 ???????????//把需要导出的pdf内容clone一份，这样对它进行转换、微调等操作时才不会影响原来界面
 ???????????var copyDom = targetDom.clone();
 ???????????//新的div宽高跟原来一样，高度设置成自适应，这样才能完整显示节点中的所有内容（比如说表格滚动条中的内容）
 ???????????copyDom.width(targetDom.width() + "px");
 ???????????copyDom.height(targetDom.height() + "px");

 ???????????$(‘body‘).append(copyDom);//ps:这里一定要先把copyDom append到body下，然后再进行后续的glyphicons2canvas处理，不然会导致图标为空

 ???????????svg2canvas(copyDom);
 ???????????html2canvas(copyDom, {
 ???????????????onrendered: function (canvas) {
 ???????????????????var imgData = canvas.toDataURL(‘image/jpeg‘);
 ???????????????????var img = new Image();
 ???????????????????img.src = imgData;
 ???????????????????//根据图片的尺寸设置pdf的规格，要在图片加载成功时执行，之所以要*0.225是因为比例问题
 ???????????????????img.onload = function () {
 ???????????????????????//此处需要注意，pdf横置和竖置两个属性，需要根据宽高的比例来调整，不然会出现显示不完全的问题
 ???????????????????????if (this.width > this.height) {
 ???????????????????????????var doc = new jsPDF(‘l‘, ‘mm‘, [this.width * 0.225, this.height * 0.225]);
 ???????????????????????} else {
 ???????????????????????????var doc = new jsPDF(‘p‘, ‘mm‘, [this.width * 0.225, this.height * 0.225]);
 ???????????????????????}
 ???????????????????????doc.addImage(imgData, ‘jpeg‘, 0, 0, this.width * 0.225, this.height * 0.225);
 ???????????????????????//根据下载保存成不同的文件名
 ???????????????????????doc.save(‘pdf_‘ + new Date().getTime() + ‘.pdf‘);
 ???????????????????};
 ???????????????????//删除复制出来的div
 ???????????????????copyDom.remove();
 ???????????????},
 ???????????????background: "#fff",
 ???????????????//这里给生成的图片默认背景，不然的话，如果你的html根节点没设置背景的话，会用黑色填充。
 ???????????????allowTaint: true //避免一些不识别的图片干扰，默认为false，遇到不识别的图片干扰则会停止处理html2canvas
 ???????????});
 ???????});
 ???});

 ???function svg2canvas(targetElem) {
 ???????var svgElem = targetElem.find(‘svg‘);
 ???????svgElem.each(function (index, node) {
 ???????????var parentNode = node.parentNode;
 ???????????//由于现在的IE不支持直接对svg标签node取内容，所以需要在当前标签外面套一层div，通过外层div的innerHTML属性来获取
 ???????????var tempNode = document.createElement(‘div‘);
 ???????????tempNode.appendChild(node);
 ???????????var svg = tempNode.innerHTML;
 ???????????var canvas = document.createElement(‘canvas‘);
 ???????????//转换
 ???????????canvg(canvas, svg);
 ???????????parentNode.appendChild(canvas);
 ???????});
 ???}

 ???function glyphicons2canvas(targetElem, fontClassName, fontFamilyName) {
 ???????var iconElems = targetElem.find(‘.‘ + fontClassName);
 ???????iconElems.each(function (index, inconNode) {
 ???????????var fontSize = $(inconNode).css("font-size");
 ???????????var iconColor = $(inconNode).css("color");
 ???????????var styleContent = $(inconNode).attr(‘style‘);
 ???????????//去掉"px"
 ???????????fontSize = fontSize.replace("px", "");
 ???????????var charCode = getCharCodeByGlyphiconsName(iconName);
 ???????????var myCanvas = document.createElement(‘canvas‘);
 ???????????//把canva宽高各增加2是为了显示图标完整
 ???????????myCanvas.width = parseInt(fontSize) + 2;
 ???????????myCanvas.height = parseInt(fontSize) + 2;
 ???????????myCanvas.style = styleContent;
 ???????????var ctx = myCanvas.getContext(‘2d‘);
 ???????????//设置绘图内容的颜色
 ???????????ctx.fillStyle = iconColor;
 ???????????//设置绘图的字体大小以及font-family的名字
 ???????????ctx.font = fontSize + ‘px ‘ + fontFamilyName;
 ???????????ctx.fillText(String.fromCharCode(charCode), 1, parseInt(fontSize) + 1);
 ???????????$(inconNode).replaceWith(myCanvas);
 ???????});
 ???}
 ???//根据glyphicons/glyphicon图标的类名获取到对应的char code
 ???function getCharCodeByGlyphiconsName(iconName) {
 ???????switch (iconName) {
 ???????????case("glyphicons-resize-full"):
 ???????????????return "0xE216";
 ???????????case ("glyphicons-chevron-left"):
 ???????????????return "0xE225";
 ???????????default:
 ???????????????return "";
 ???????}
 ???}
</script>




以上完美实现你的导出pdf的问题。代码库地址： 
https://github.com/zhangshaoliang/downLoadPDF

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